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<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
        "use strict"
        function foo() {
            console.log("foo函数(strict)",this);
        }
        foo()

        let obj = {
            name:'gkd',
            bar: function(){
                console.log('bar:',this);
            }
        }
        let baz = obj.bar
        // obj.bar()
        baz()

        function test(fn){
            fn()
        }
        test(obj.bar)
    </script>
</body>
</html>